The time from 9:00 AM to 9:00 PM is a total of 12 hours. There are no additional minutes involved, so the duration is simply 12 hours and 0 minutes.
6 PM to 12 midnight = 6 hours 12 midnight to 9 am = 9 hours Total 15 hours X 60 minutes = 900 minutes
23 hours and 38 minutes.
7 hours and 30 minutes
There are 16 hours from 9 PM to 1 PM the next day.
You can subtract the hours and the minutes separately.
6 hours and 30 minutes
5 hours and 30 minutes.
4 hours and 15 minutes.
4 hours and 20 minutes.
3 hours and 30 minutes.
3 hours and 12 minutes.
8 hours and 30 minutes.